Air-to-water Heat Pump
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(5) The appliance is intended to be permanently connected to the water mains and not connected
by a hose-set.
(6) The type of the pressure-relief device is A3J, and this device shall be installed with threaded
connection.
(7) The replenishing water pressure in water tank shall be beyond 0.2MPa and below 0.7MPa.
(8) The method of water drainage must be operated strictly abide by the instruction on the label of
the water tank.
10.4 Connection of waterway system
(1) Preparation of pipelines: Circulating water outlet/inlet pipe must be hot water pipe, PPR pipe
with nominal out diameter of dn25 and S2.5 series (wall thickness of 4.2mm) being
recommended. Cooling water inlet pipe and hot water outlet pipe of water tank should also
be hot water pipe, PPR pipe with nominal out diameter of dn20 and S2.5 series (wall thickness
of 3.4mm) being recommended. If other insulating pipes are used, please check relevant
information for the proper pipe size and wall thickness.
(2) Installation of circulating water inlet/outlet pipes: connect the water inlet of the unit with
circulating outlet of water tank and water outlet of unit with circulating inlet of water tank.
(3) Installation of water inlet/outlet pipes of the water tank: safety check valve, filter and cut-off
valve must be installed for the water inlet pipe according to the installation sketch of the unit. At
least a cut-off valve is needed for the water outlet pipe.
(4) Installation of blow-off pipes at the bottom of water tank: connect a piece of PPR pipe with
drainage outlet to floor drain. A cut-off valve must be installed in the middle of the drainage pipe
and at the place where it is easy to be operated by the users.
(5) After connection of all waterway pipelines, perform the leakage test firstly. After that, bind up the
water pipes, water temp sensor and wires with wrapping tapes attached with the unit.
(6) Refer to Installation Sketch of the Unit for details.
NOTES:
(1) Waterway pipelines can’t be installed until water heater unit is fixed. Do not let dust and other
sundries enter into pipeline system during installation of connection pipes.
(2) After connection of all waterway pipelines, perform leakage test firstly. After that, perform heat
preservation of waterway system; meanwhile, pay more attention to valves and pipe joints.
Ensure enough thickness of insulated cotton. If necessary, install heating device for pipeline to
prevent the pipeline from freezing.
(3) Hot water supplied from insulated water tank depends on pressure of water tap, so there must
be supply of tap water.
(4) During using, the cut-off valve of cooling water inlet of water tank should be kept normally on.
